Taxonomic survey of representatives of family Pinnulariaceae (Naviculales, Bacillariophyceae) in the Parque Estadual das Fontes do Ipiranga, São Paulo, Brazil. Two genera (Caloneis with 1 and Pinnularia with 12 species) and 20 taxa altogether, including 13 species and seven varieties that are not the typical of their respective species were identified. One variety, Pinnularia brauniana (Grunow) Mills var. sanctipaulensis Rocha, is described as new to science. Pinnularia brauniana (Grunow) Mills var. sanctipaulensis Rocha and P. subgibba Krammer var. lanceolata Gaiser & Johanser are the best geographically represented species in the Parque area occurring in 5 localities, whereas and Caloneis hyalina Hustedt, Pinnularia biceps Gregory var. biceps, P. grunowii Krammer, P. joculata (Manguin) Krammer, P. schoenfelderi Krammer, P. subanglica Krammer, P. tabellaria Ehrenberg and P. viridis (Nitzsch) Ehrenberg var. viridis are the least represented ones, been found in a single locality each.
Brazil; Caloneis; Pinnularia
